20894044815 has 48 divisors (see below), whose sum is σ = 42270778368. Its totient is φ = 9348331968.

The previous prime is 20894044807. The next prime is 20894044877. The reversal of 20894044815 is 51844049802.

It is not a de Polignac number, because 20894044815 - 2³ = 20894044807 is a prime.

It is a super-2 number, since 2×20894044815² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 690837 + ... + 720446.

It is an arithmetic number, because the mean of its divisors is an integer number (880641216).

Almost surely, 2^20894044815 is an apocalyptic number.

20894044815 is an abundant number, since it is smaller than the sum of its proper divisors (21376733553).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20894044815 is a wasteful number, since it uses less digits than its factorization.

20894044815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1411348 (or 1411345 counting only the distinct ones).

The product of its (nonzero) digits is 368640, while the sum is 45.

The spelling of 20894044815 in words is "twenty billion, eight hundred ninety-four million, forty-four thousand, eight hundred fifteen".